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Finding the Fourth Proportional to 803.60, 1,207.80 and 789.20

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Solution

The fourth proportional to 803.60, 1,207.80 and 789.20 is: 1,186.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.60 : 1,207.80 = 789.20 : x
  2. Step 2: Convert to fraction form
    803.60/1,207.80 = 789.20/x
  3. Step 3: Cross multiply
    803.60x = 1,207.80 × 789.20
  4. Step 4: Simplify right side
    803.60x = 953,195.76
  5. Step 5: Solve for x
    x = 953,195.76/803.60
  6. Step 6: Final answer
    x = 1,186.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.